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AN3352 Fiches technique(PDF) 20 Page - STMicroelectronics

No de pièce AN3352
Description  Dual LNB power supply based on the LNBH24L
PDF  26 Pages
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Fabricant  STMICROELECTRONICS [STMicroelectronics]
Site Internet  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN3352 Fiches technique(HTML) 20 Page - STMicroelectronics

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Component selection guidelines
AN3352
20/26
Doc ID 018526 Rev 3
2.9
Undervoltage protection diode (D2)
During a short-circuit event on the LNB output, negative voltage spikes may occur on the
VoRX pin. To prevent reliability problems, a low-cost Schottky diode with low VF clamping
voltage is used between this pin and GND (see D2 in Figure 6). It is recommended to place
the protection diode cathode as close as possible to the VoRX pin.
Figure 13.
Tone amplitude vs. R9 value
0.3
0.35
0.4
0.45
0.5
0.55
0.6
0.65
0.7
0.75
0.8
0.85
0.9
0.51
1.52
2.5
3
3.5
4
4.5
R9 value (kohm)



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